Write the balanced equation for the following.
A) Potassium bromide on treatment with manganese dioxide and sulphuric acid gives manganese and potassium sulphates, bromine and water.
B) In the preparation of phosphate fertilisers, calcium phosphate in phosphate rock is converted into phosphoric acid and calcium sulphate.
C) Sodium nitrite is produced by the reaction of the oxides of nitrogen in which nitrogen shows valency 2 and 4 in a solution of sodium carbonate.

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Solution

$a . 2 K B r + M n O_{2} + 2 H_{2} S O_{4} \to M n S O_{4} + K_{2} S O_{4} + B r_{2} + 2 H_{2} O b . C a_{3} (P O_{4})_{2} + 3 H_{2} S O_{4} \to 2 H_{3} P O_{4} + 3 C a S O_{4} c . N a_{2} C O_{3} + H_{2} O + N O + N O_{2} \to 2 N a N O_{2} + H_{2} C O_{3} V a l e n c y o f N : (2) (4)$

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Write the balanced chemical equations of the following reactions.

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